mirror of https://gitee.com/openkylin/linux.git
rtc: pcf2123: port to regmap
Also remove pcf2123_delay_trec. This claimed to add a 30ns delay to SPI writes, but I could not see any reference to this requirement in the datasheet. Closest thing I could find to a requirement are timings for the SPI chip enable line, which cannot be controlled by this driver (the ndelay came after the call to spi_write_then_read, which means it would sleep after CE has already gone inactive). Things seem to work fine without it. Signed-off-by: Dylan Howey <Dylan.Howey@tennantco.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Dylan Howey
Alexandre Belloni
parent
2372a7d32b
commit
790d033933
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@ -44,6 +44,7 @@
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#include <linux/rtc.h>
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#include <linux/spi/spi.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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/* REGISTERS */
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#define PCF2123_REG_CTRL1 (0x00) /* Control Register 1 */
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@ -98,6 +99,7 @@
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#define OFFSET_SIGN_BIT 6 /* 2's complement sign bit */
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#define OFFSET_COARSE BIT(7) /* Coarse mode offset */
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#define OFFSET_STEP (2170) /* Offset step in parts per billion */
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#define OFFSET_MASK GENMASK(6, 0) /* Offset value */
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/* READ/WRITE ADDRESS BITS */
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#define PCF2123_WRITE BIT(4)
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@ -108,66 +110,33 @@ static struct spi_driver pcf2123_driver;
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struct pcf2123_plat_data {
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struct rtc_device *rtc;
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struct regmap *map;
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};
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/*
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* Causes a 30 nanosecond delay to ensure that the PCF2123 chip select
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* is released properly after an SPI write. This function should be
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* called after EVERY read/write call over SPI.
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*/
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static inline void pcf2123_delay_trec(void)
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{
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ndelay(30);
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}
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static int pcf2123_read(struct device *dev, u8 reg, u8 *rxbuf, size_t size)
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{
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struct spi_device *spi = to_spi_device(dev);
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int ret;
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reg |= PCF2123_READ;
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ret = spi_write_then_read(spi, ®, 1, rxbuf, size);
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pcf2123_delay_trec();
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return ret;
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}
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static int pcf2123_write(struct device *dev, u8 *txbuf, size_t size)
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{
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struct spi_device *spi = to_spi_device(dev);
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int ret;
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txbuf[0] |= PCF2123_WRITE;
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ret = spi_write(spi, txbuf, size);
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pcf2123_delay_trec();
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return ret;
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}
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static int pcf2123_write_reg(struct device *dev, u8 reg, u8 val)
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{
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u8 txbuf[2];
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txbuf[0] = reg;
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txbuf[1] = val;
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return pcf2123_write(dev, txbuf, sizeof(txbuf));
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}
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static const struct regmap_config pcf2123_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.read_flag_mask = PCF2123_READ,
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.write_flag_mask = PCF2123_WRITE,
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.max_register = PCF2123_REG_CTDWN_TMR,
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};
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static int pcf2123_read_offset(struct device *dev, long *offset)
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{
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int ret;
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s8 reg;
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struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
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int ret, val;
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unsigned int reg;
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ret = pcf2123_read(dev, PCF2123_REG_OFFSET, ®, 1);
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if (ret < 0)
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ret = regmap_read(pdata->map, PCF2123_REG_OFFSET, ®);
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if (ret)
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return ret;
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if (reg & OFFSET_COARSE)
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reg <<= 1; /* multiply by 2 and sign extend */
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else
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reg = sign_extend32(reg, OFFSET_SIGN_BIT);
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val = sign_extend32((reg & OFFSET_MASK), OFFSET_SIGN_BIT);
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*offset = ((long)reg) * OFFSET_STEP;
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if (reg & OFFSET_COARSE)
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val *= 2;
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*offset = ((long)val) * OFFSET_STEP;
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return 0;
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}
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@ -184,6 +153,7 @@ static int pcf2123_read_offset(struct device *dev, long *offset)
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*/
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static int pcf2123_set_offset(struct device *dev, long offset)
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{
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struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
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s8 reg;
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if (offset > OFFSET_STEP * 127)
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@ -203,16 +173,18 @@ static int pcf2123_set_offset(struct device *dev, long offset)
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reg |= OFFSET_COARSE;
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}
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return pcf2123_write_reg(dev, PCF2123_REG_OFFSET, reg);
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return regmap_write(pdata->map, PCF2123_REG_OFFSET, (unsigned int)reg);
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}
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static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
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u8 rxbuf[7];
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int ret;
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ret = pcf2123_read(dev, PCF2123_REG_SC, rxbuf, sizeof(rxbuf));
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if (ret < 0)
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ret = regmap_bulk_read(pdata->map, PCF2123_REG_SC, rxbuf,
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sizeof(rxbuf));
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if (ret)
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return ret;
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if (rxbuf[0] & OSC_HAS_STOPPED) {
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@ -241,7 +213,8 @@ static int pcf2123_rtc_read_time(struct device *dev, struct rtc_time *tm)
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static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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u8 txbuf[8];
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struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
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u8 txbuf[7];
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int ret;
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dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
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@ -251,27 +224,27 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
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tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);
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/* Stop the counter first */
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ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_STOP);
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if (ret < 0)
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ret = regmap_write(pdata->map, PCF2123_REG_CTRL1, CTRL1_STOP);
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if (ret)
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return ret;
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/* Set the new time */
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txbuf[0] = PCF2123_REG_SC;
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txbuf[1] = bin2bcd(tm->tm_sec & 0x7F);
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txbuf[2] = bin2bcd(tm->tm_min & 0x7F);
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txbuf[3] = bin2bcd(tm->tm_hour & 0x3F);
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txbuf[4] = bin2bcd(tm->tm_mday & 0x3F);
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txbuf[5] = tm->tm_wday & 0x07;
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txbuf[6] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
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txbuf[7] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
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txbuf[0] = bin2bcd(tm->tm_sec & 0x7F);
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txbuf[1] = bin2bcd(tm->tm_min & 0x7F);
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txbuf[2] = bin2bcd(tm->tm_hour & 0x3F);
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txbuf[3] = bin2bcd(tm->tm_mday & 0x3F);
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txbuf[4] = tm->tm_wday & 0x07;
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txbuf[5] = bin2bcd((tm->tm_mon + 1) & 0x1F); /* rtc mn 1-12 */
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txbuf[6] = bin2bcd(tm->tm_year < 100 ? tm->tm_year : tm->tm_year - 100);
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ret = pcf2123_write(dev, txbuf, sizeof(txbuf));
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if (ret < 0)
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ret = regmap_bulk_write(pdata->map, PCF2123_REG_SC, txbuf,
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sizeof(txbuf));
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if (ret)
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return ret;
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/* Start the counter */
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ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_CLEAR);
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if (ret < 0)
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ret = regmap_write(pdata->map, PCF2123_REG_CTRL1, CTRL1_CLEAR);
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if (ret)
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return ret;
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return 0;
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@ -279,33 +252,33 @@ static int pcf2123_rtc_set_time(struct device *dev, struct rtc_time *tm)
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static int pcf2123_reset(struct device *dev)
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{
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struct pcf2123_plat_data *pdata = dev_get_platdata(dev);
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int ret;
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u8 rxbuf[2];
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unsigned int val = 0;
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ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_SW_RESET);
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if (ret < 0)
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ret = regmap_write(pdata->map, PCF2123_REG_CTRL1, CTRL1_SW_RESET);
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if (ret)
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return ret;
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/* Stop the counter */
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dev_dbg(dev, "stopping RTC\n");
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ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_STOP);
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if (ret < 0)
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ret = regmap_write(pdata->map, PCF2123_REG_CTRL1, CTRL1_STOP);
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if (ret)
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return ret;
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/* See if the counter was actually stopped */
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dev_dbg(dev, "checking for presence of RTC\n");
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ret = pcf2123_read(dev, PCF2123_REG_CTRL1, rxbuf, sizeof(rxbuf));
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if (ret < 0)
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ret = regmap_read(pdata->map, PCF2123_REG_CTRL1, &val);
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if (ret)
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return ret;
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dev_dbg(dev, "received data from RTC (0x%02X 0x%02X)\n",
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rxbuf[0], rxbuf[1]);
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if (!(rxbuf[0] & CTRL1_STOP))
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dev_dbg(dev, "received data from RTC (0x%08X)\n", val);
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if (!(val & CTRL1_STOP))
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return -ENODEV;
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/* Start the counter */
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ret = pcf2123_write_reg(dev, PCF2123_REG_CTRL1, CTRL1_CLEAR);
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if (ret < 0)
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ret = regmap_write(pdata->map, PCF2123_REG_CTRL1, CTRL1_CLEAR);
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if (ret)
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return ret;
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return 0;
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@ -332,6 +305,13 @@ static int pcf2123_probe(struct spi_device *spi)
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return -ENOMEM;
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spi->dev.platform_data = pdata;
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pdata->map = devm_regmap_init_spi(spi, &pcf2123_regmap_config);
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if (IS_ERR(pdata->map)) {
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dev_err(&spi->dev, "regmap init failed.\n");
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goto kfree_exit;
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}
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ret = pcf2123_rtc_read_time(&spi->dev, &tm);
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if (ret < 0) {
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ret = pcf2123_reset(&spi->dev);
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